Soldering device



Patented Aug. 2, 1949 UNITED STATES PATENT OFFICE SOLDERING DEVICE Sh McMillan, an F an isco Calif..-

Application October 1, 1945', Serial No. 619,548

(01. vMgr- 26 )v 2 Claims. 1

The present invention relates to improvements in a soldering device, and its principal object is to provide an electrical soldering device that is simple in construction, inexpensive to manuiacture, easy to operate and readily lends itself to a variety of operations involving different deareas of power.

More particularly it is proposed to use a carbon electrode for cooperation with the work in controlling an electric circuit for heating the electrode and the work for melting the solder.

It is still further proposed to provide connec tions whereby the work is made part of the electrical circuit providing the required heat.

Another object of my invention is to provide convenient manipulating means for the electrode.

I further propose to provide control means whereby different degrees of power are made available for different kinds of work to be performed.

And finally, it is proposed, in one form of the invention, to use a carbon rod in combination with a sliding contact for producing different degrees of resistance in the soldering circuit.

Further objects and advantages of my invention will be presented as the specification proceeds, and the novel features of my invention will be fully defined in the claims attached hereto.

The preferred form of my invention is illustrated in the accompanying drawing, in which:

Figure 1 shows diagrammatically one form of my soldering unit; and

Figure 2 shows a modified form of the invention.

While I have shown only the preferred forms of my invention, it should be understood that various changes or modifications may be made within the scope of the claims hereto attached without departing from the spirit of the invention.

Referring to the drawing in detail, and particularly to the form illustrated in Figure 1, my invention comprises in its principal features, a pair of line wires l and 2, a clip 3 for attaching one of the line wires to the work, variable resistances 4 in the line wires, and an electrode 5 forming the terminal of the other line wire.

The line wires l and 2 may be connected to any source of electrical power, such as a battery or an outlet from any main line that may be available. Where the work is to be done about an automobile or other motor vehicle, the battery of the machine furnishes an excellent source of supply, although my invention may be readily 2 designed for any suitable, volta e, such as six, welre, one. hundred and; ten, two hundred and twenty, and upward.

The variable resistances shown in Figure l comprise calibrated carbon rods 6 and sliding contacts I movable therealong to increase and decrease the resistance.

The electrode 5 is also in the nature of a carbon rod, and for convenience of mam'pulation, the rear end of the carbon rod has a sleeve i3 mounted thereon for connection to the line wire, as at 9, and a handle [0 mounted upon the sleeve so as to surround the connection and preferably also a portion of the line wire I, as shown.

The sleeve 8 is preferably made of copper or other suitable conducting material, while the handle is constructed of non-conducting material.

The electrode assembly is shown in longitudinal section in Figure 1, and in side view in Figure 2, it being the same in both forms of the invention.

In use, the amount of current to be used is adjusted by sliding the contacts 7 to the proper position with respect to the calibrated carbon rods 6.

The clip 3 is then fastened to the work to establish electrical connection to the point where the solder is to be applied. Thereupon the operator, holding the solder in one hand and the handle II] in the other, applies the points of the solder and of the electrode to the spot where the solder is to be applied.

Where the material to be operated upon is relatively light or thin, such as a thin tin plate or the strands of the end of a wire, the two points of the solder and the electrode be applied conveniently from opposite sides.

The point of the electrode will immediately turn red hot and will heat the work and melt the solder so that the operator readily spread and distribute the solder advantageously over the surfaces to be joined.

The arrangement illustrated in Figure 2 is similar to that of Figure 1, except that a different resistance arrangement is used in one of the lines. The latter comprises a plurality of resistances l I of difierent values, adapted to be selectively connected into the circuit by means of a plug I2 and suitable sockets [3.

The power furnished at each plug-in may be indicated in Watts, as shown.

In practice, the resistances, in either form, may be enclosed in a suitable box, which may have the different Wattages at different points marked on the outside thereof.

Iclaim:

1. In a soldering device, a pair of line wires adapted for connection to a source of energy, means for electrically connecting one of the wires to the work, a variable resistance in each of the wires spaced from the source of ener y, and a carbon electrode connected to the second wire for heating the work when brought into contact therewith.

2. In a soldering device, a pair of separate line wires adapted for connection to opposite poles of a battery or the like, a clamp at the free end of one of the wires for electrically connecting the same to the work, a variable resistance in REFERENCES CITED The following references are of record in the file of this patent:

each of the wires spaced from the battery to allow 15 5 UNITED STATES PATENTS Number Name Date 311,820 Doyle Feb. 3, 1885 925,551 Abbott June 22, 1909 10 1,573,925 Franke et al July 11, 1924 1,869,448 Woodling Dec, 27, 1930 1,880,940 Enninga Apr. 21, 1931 1,995,494 Bardet et a1. Mar. 27, 1933 FOREIGN PATENTS Number Country Date 845,971 France May 2'7, 1939 

